Does a Holding Company Increase Your Corporation Tax? The Associated Companies Rule Explained

Owners thinking about a holding company often ask the same thing first: will it push up our corporation tax? The honest answer is that it sometimes does, by a modest and capped amount, and the sum is easy to work out before you commit. The reason is the associated companies rule.

The rates and limits for 2026/27

For the financial year starting 1 April 2026:

• profits up to £50,000 are taxed at the small profits rate of 19%
• profits above £250,000 are taxed at the main rate of 25%
• profits in between get marginal relief, using the standard fraction of 3/200, which produces an effective rate of 26.5% on each extra pound in that band

Those two limits are divided by the number of associated companies plus one (section 18D of the Corporation Tax Act 2010). Companies are associated if one controls the other, or the same person or people control both, at any time in the accounting period (section 18E). A holding company controls its subsidiary, so putting one above a single trading company usually halves the limits to £25,000 and £125,000.

How the tax is worked out

Where profits fall between the limits, the corporation tax is 25% of profits, less 3/200 of the gap between the upper limit and profits. Dividends received from a 51% subsidiary are left out of "augmented profits" (section 18L), so cash flowing up to the holding company does not change the holding company's own rate.

A worked example with one trading company

These figures are illustrations, not client examples. Take a trading company with £100,000 of profit in a 12-month period.

• On its own: 25% of £100,000 is £25,000, less marginal relief of 3/200 x £150,000 (£2,250), giving £22,750.
• With an associated holding company: £25,000, less 3/200 x £25,000 (£375), giving £24,625.
• The extra cost is £1,875.

The pattern across other profit levels looks like this:

• £25,000: £4,750 either way, so no extra cost
• £40,000: £7,600 on its own, £8,725 with a holding company, so £1,125 extra
• £50,000 to £125,000: £1,875 extra
• £150,000: £1,500 extra
• £200,000: £750 extra
• £250,000 and above: no extra cost, because the company pays 25% in both cases

With one associated company the extra cost never exceeds £1,875 a year. It peaks for profits between £50,000 and £125,000 and tapers away at both ends. A company already paying 25% on everything loses nothing in rate terms.

Two trading companies under one holding company

Suppose you own two trading companies directly and each makes £100,000. Because you control both, they are already associated, so each has limits of £25,000 and £125,000 and pays £24,625, or £49,250 in total.

Now add a holding company above both. If it counts as an associated company, each trading company has two associated companies and the limits fall to £16,667 and £83,333. At £100,000 each company is above the upper limit and pays £25,000, so the group pays £50,000. The extra cost of an active holding company is £750 a year across the group.

The passive holding company exception

A holding company is ignored for this purpose if it counts as not carrying on a business under section 18F of the Corporation Tax Act 2010. Throughout the accounting period it must:

1. own no assets other than shares in its 51% subsidiaries
2. have no income other than dividends
3. pay out to its own shareholders at least as much as it receives in dividends, with those dividends being exempt distributions
4. have no chargeable gains
5. have no management expenses referable to the period
6. claim no qualifying charitable donations

That list is strict. In practice a holding company fails it if it keeps any cash of its own, charges management fees, pays its own accountancy or bank charges as management expenses, holds property or investments, or retains dividends rather than passing them all on.

A genuinely dormant company is also disregarded, because an associated company that carried on no trade or business in the period does not count.

Why most holding companies are not passive, and why that is usually fine

The most common reason for a holding company is to move surplus cash away from the risks of the trade. Profit goes up as an exempt dividend and stays there. That breaks the first three conditions immediately.

So most useful holding companies are associated companies, and the real question is whether the benefit is worth up to £1,875 a year per trading company. For a business with a large cash balance exposed to trading risk, or a second venture that needs funding from tax-free dividends, it almost always is.

Where a holding company exists only to own shares, for example during succession planning, keeping it passive can be worth the effort. Its few costs can sometimes be met elsewhere in the group, it holds no cash, and dividends pass straight through. Any such arrangement needs to be genuine.

The holding company's own tax

The holding company pays corporation tax only on its taxable profits, typically interest on cash it holds, rent or management charges. Exempt dividends from the trading company are not taxed. If it earned £10,000 of interest, its own lower limit would be £25,000 with one associated company, so the interest would still be taxed at 19%, or £1,900. For a typical group, the whole associated companies cost sits in the trading company.

Practical points to remember

• A holding company inserted part-way through the year is associated for the whole accounting period.
• If an accounting period is shorter than 12 months, the limits are reduced proportionately as well as divided.
• A holding company of trading subsidiaries is not a close investment-holding company, so it can still use the small profits rate on its own taxable profits. One that mainly holds portfolio investments is, and pays 25% on everything.
• Overseas companies under common control can count as associated companies, so list every company you control, not just the UK ones.

The numbers above are a guide. Your own position depends on your profits, your other companies and what the holding company will actually do. Our specialist team prepares the advice, which is reviewed by a Chartered Tax Adviser, and we can show you the cost alongside the benefits before you decide. To talk it through, book a call with our team. You can also read our overview of the holding company service.

This article is general information, not advice. Tax rules change and their effect depends on your circumstances. Please speak to us before acting.

Our specialist practice Holding Company covers group structures and holding company insertions in more depth.